CREATETABLEstudents(idINTAUTO_INCREMENTPRIMARYKEY,nameVARCHAR(100),ageINT,majorVARCHAR(100)); 1. 2. 3. 4. 5. 6. 现在,我们希望插入多条学生信息。我们可以使用以下INSERT语句: INSERTINTOstudents(name,age,major)VALUES('Alice',20,'Computer Science'),('Bob',22,'Mathematics'),('Charlie',21,'Ph...
INSERT INTO 表名 子查询很常用,子查询替代原先插入语句中VALUES(……,……),(……,……),……的部分 TRUNCATE 'orders_archived'; -- 也可右键该表点击 truncate /*新的 8.0版 MySQL 的语法好像变为了 TRUNCATE TABLE orders_archived? 那样就与 DROP TABLE orders_archived 一致了*/ INSERT INTO orders_...
0 运行 AI代码解释 mysql> create table if not existstest_key( -> id int unsigned primary key comment '这个是学生的学号', -> name varchar(20) not null -> ); Query OK, 0 rows affected (0.03 sec) mysql> desc test_key; +---+---+---+---+---+---+ | Field | Type | Null...
1)I need to insert b(known value) into table1 and database to create id(because of PK autoincrement). 2)I need to insert multiple rows into table2 using the created id (step 1) and c (known values). Do I need transactions to ensure insertion (in case of system crash ) in both...
Intention shared (IS): Transaction T intends to set S locks on individual rows in table t. Intention exclusive (IX): Transaction T intends to set X locks on those rows. 事务在请求S锁和X锁前,需要先获得对应的IS、IX锁。 Before atransactioncan acquire an S lockona rowintablet, ...
_mode让其现出原形 mysql> create table t1(x char(5),y varchar5)); Query OK, 0 rows affected (0.26 sec) #char存5个字符,而varchar存4个字符 mysql> insert into t1 values('你瞅啥 ','你瞅啥 '); QueryOK, 1 row affected (0.05 sec) mysql> SET sql_mode=''; Query OK, 0 rows ...
#180930 0:25:01 server id 1 end_log_pos 211935698 Table_map: 'canal_test'.'test_tbl' mapped to number 25 #180930 0:25:01 server id 1 end_log_pos 211935744 Write_rows: table-id 25 flags: STMT_END_F ... '/*!*/; ### INSERT INTO canal_test.test_tbl ...
CREATE TABLE t8 ( a int AUTO_INCREMENT PRIMARY KEY, b int, c int, unique key ub(b) ) engine=InnoDB; insert into t8 values (NULL,1,2) 2.3 过程分析 在每次执行一条语句之后都执行show innodb engine status查看事务的状态,执行完 delete 语句,事务相关日志显示如下: ...
MySQL also uses enormous data sets, up to 50 million rows and columns or more in a table. The default document size limit for a table is 4GB, however, you can build this (if your operating system can deal with it) to a hypothetical restriction of 8 million terabytes (TB). If you ...
I was trying to insert records into multiple tables in one file. The first two queries ran very well but the third one did not run. The first table is normal table while the last 2 tables are cross-reference tables, which store primary keys of two tables each. Here is the code ...